So how does the ultra-fit runway star work out? She gets some expert help from AKT InMotion founder Anna Kaiser, who pushes the model through a strength training and cardio interval series that the New York City-based dance cardio dynamo tells us leaves Kloss drenched in sweat—and feeling more energized than ever before.

“Karlie works really, really hard,” says Kaiser, who has been training Kloss since April. “She’s super-focused, and we have so much fun together. When a song comes on that she loves, we sing along.” How much fun? The two, who are on a “big Beyonce high,” notes Kaiser, just went to see Queen Bey in concert. (They also like to play Justin Bieber, Black Eyed Peas, Jay-Z, and Rihanna as well.)

Does the leggy model ever have trouble getting through the trainer’s tough, sweaty workout? “At the beginning, she would stop—it’s really hard,” admits Kaiser. “But now she pushes through. Her head’s in the game.”

And her heart, too: Kloss wears a heart rate monitor to every single class (AKT offers them up to everyone—yes, even us normals), and Kaiser pushes her to be at 75-90 percent of her maximum heart rate throughout every sweat session. (And you thought that models were lightweights….)

But the most impressive thing about Kloss’ fitness regimen? Her dedication. “Karlie is so busy, but she always finds time to fit in a workout,” says Kaiser. “Sometimes she’ll come directly from a shoot. Even if she’s had a very long day, she shows up.” And if she happens to be on the road? No excuses from Kloss—she’ll stream workouts from Kaiser’s new app.

Ready to up your game and workout like Karlie Kloss? Below, Anna Kaiser exclusively shares with Well+Good the supermodels training regimen.

Kaiser incorporates TRX into her cardio segments with Kloss, but you can emulate her workout without them. “Think of it as a kickboxing routine,” says Kaiser of the workout they do. Warning: Get ready to seriously sweat.

Do knee repeaters (30 seconds on each leg). Put one leg straight behind you with the front leg bent into a lunge position. Stand tall with your arms raised above your head and bring your back leg forward and up with a bent knee, then take it back behind you into the lunge position. Maintain a tight core as you repeat with each leg.

Do 10 squat jumps on and off the box or step—extend your arms straight in front of you as you lower into a seated squat with your thighs parallel to the floor. Pressing through the balls of your feet, jump straight into the air as you exhale.

Jackknives. Lie on the floor with your arms extended above your head and your legs extended as well. Exhale as you bend at the waist and have your arms and legs meet in a jackknife position (legs in a 45 degree angle and arms straight). Inhale and lower back to the floor.

“We always foam roll after every workout,” says Kaiser. “Karlie was really surprised by how painful it is! But when you’re an active person, it’s necessary in order to keep your joints and muscles healthy so you don’t risk injury.”

Use a foam rolle to roll out your quads, hamstrings, glutes, upper back, and any other part of your body that needs stretching.